Power Circuit Designer

Buck | Boost | LDO

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Topology

Converter Type

Design Priority

Theory

Buck Converter (Step-Down)

Steps voltage down using high-frequency switching.

Key equations:
D = V_out / V_in
L = V_out(1-D) / (f_sw × ΔI_L)

Operation: When switch ON, energy stored in inductor. When OFF, diode conducts and inductor releases energy to load.

Boost Converter (Step-Up)

Steps voltage up using inductor energy storage.

Key equations:
D = 1 - V_in / V_out
L = V_in × D / (f_sw × ΔI_L)

Operation: When switch ON, inductor charges from input. When OFF, inductor + input voltage combine to boost output.

LDO Regulator (Linear)

Linear dropout regulator - no switching noise.

Key equations:
P_diss = (V_in - V_out) × I_out
η = V_out / V_in

Trade-offs: Low noise, simple design, but wastes power as heat. Best when V_in ≈ V_out.

Input Parameters

Input Voltage (nominal)

Output Voltage

Output Current (max)

Switching Frequency

kHz

Simulation

Duration

Transient Waveforms

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Power Circuit Designer

Components

Performance

Warnings